Shears.



(I. PARRINGTON.

SHEARS.

APPLIOATION FILED MAR.20,1913.

1,076,667.. Patented 00a. 28, 1913.

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TTED STATES PATENT OFFICE.

JOEL FARRINGTON, 0F SPRING-B030, PENNSYLVANIA, ASSIGNOE TO MINNIE E.SHELDON, OF SPRINGBORO, PENNEIYLVANIA.

SHEARS.

Specification of Letters Patent.

Patented Oct. 28, 1913.

Application filed March 20, 1913. Serial No. 755,618.

To all whom it may concern:

Be it known that I, JOEL FARRINGTON, a citizen of the United States,residing at Springboro, in the county of Crawford and State ofPennsylvania, have invented new and useful Improvements in Shears, ofwhich the following is a specification.

This invention relates to shears and consists in certain improvements inthe construction thereof as will be hereinafter fully described andpointed out in the claims.

More particularly the invention relates to that type of shears whereingreat pressures are required on the shearing blades as for instance inthe clipping of bolts and like material.

The invention is illustrated in the accompanying drawings as followsFigure 1 is a side elevation of the shears. Fig. 2 is a plan view partlyin section. Fig. 3 is a section taken along the longitudinal axis of thedevice and on the line 3-3 in Fig. 2.

11 marks the shearing blades, and 2-2 the bolts on which the shearingblades are pivoted. The bolts extend through the links 33 and thus forma pivotal mounting for the blades. One of the blades 1 is provided witha projection 1 which extends into the detent 5 in the opposite blade.This holds the blades in. proper relation or against end movement of onerelatively to the other. The blades are provided with the shanks 6-4-3.Operating levers 9 9 are pivoted at their outer ends to the rear ends ofthe shanks by means of the bolts 88. Operating handles extend from thelevers 99. The levers 9--9 are connected through the end 10 of a link11. Bolts 12-12 extend through the levers S 9 and the end 10. It will bereadily seen that as the levers 9-9 are swung into and out of alinementthe shanks 66 are swung apart and the blades 1-l together and as thearms 9 approach alinement the leverage increases. The ends 1313 of theshanks are rounded with the pivotal axis as a center and the levers 9have the shoulders 1 1 which operate against the surfaces 13 thus takingthe pressure off the bolts 8. The ends of the arms at 15-15 are alsorounded with the pivotal axis at the center of the bolt as a een-. terso that as these levers are swung they roll on the surface 15, thusrelieving the bolts 12-12 from strain. The links 1616 of a toggle leverare connected with the shanks by the bolts 1717. The endsof the links1616 are connected by a bolt 18, this bolt extending through the links11. It will be readily observed that as the levers 9 are swung to throwopen the shanks 6, the link 11 is forced forward, thus forcing the links16-16 toward alinement so that there is an outward pressure by reason ofthe links 1616 as well as by reason of the levers 9 9. The links 16-16are so proportioned with relation to the throw of the lovers 9-4) thatthey exert pressure on the shanks 6 as well as the levers 99 as thelevers are swung. Thus, there is a distribution of pressure on theshanks and a greater pressure delivered to the blades 1-1.

I prefer to provide one of the links 16 with a curved surface 19 whichoperates on a curved surface 20, said surfaces forming arcs with theaxis of the bolt 18 as a center. In this way the bolt 18 is relieved ofsome of its wear. A stop 21 is preferably provided to limit the inwardmovement of the operating handles. It may be made adjustable if desiredso as to compensate for the wear on the blades and where this is thecase the levers 1616 are not initially brought to complete alinement butapproximately permitting of further movement to take up the wear on theblades 1-1 by the adjustment of the stop.

While I have shown the invention as involving the blades 1-1 extendingin alinement with the shanks, it will be understood that the cuttingedge may be parallel to the axis of the bolts 2 or otherwise arranged asdesired.

It will be noted that the link 11 with its end 10 operating on thepivots formed by the bolts 12 is maintained in alinement with thecentral line of the shears by the connection of the front end of thelink 11 with the bolt 18. The effect of this to compel a uniformmovement of the two blades and of the handles 7. This function of thelink 11 I consider an important one in my invention.

While I have described the cutting blades as shear blades I wish to beunderstood as including any type of blade alfecting a cutting action,and while I have shown the device with a cutting edge lengthwise of theshear I do not wish to be limited by such a direction of the cuttingedge.

What I claim as new is 1. In a pair of shears, the combination ofblades; a pivotal mounting for the blades; shanks extending from saidblades; levers having their outer ends pivoted to the rear ends of saidshanks; operating handles extending from the levers; a connection between the inner ends of said levers; a toggle lever between said shanks;and a connection between said first mentioned levers and said togglelever.

2. In a pair of shears, the combination of blades; a pivotal mountingfor said blades; shanks extending from said blades; levers having theirouter ends pivoted to the rear end of said shanks; opera-ting handlesextending from said levers; a connection between the inner ends of saidlevers; a toggle lever between said shanks; and a link connectionbetween said first mentioned levers and said toggle lever the links ofsaid toggle lever being formed of curved surfaces to sustain the thrust.

3. In a pair of shears the combination of blades; a pivotal mounting forthe blades; shanks extending from said blades; levers having their outerends pivoted on said shanks; operating handles extending from saidlevers; a connection between the inner ends of said levers, the leversbeing separately pivoted to said connection and having curved surfacesengaging as the levers are swung to sustain the thrust; a toggle leverbetween said shanks; and a connection between said first mentionedlevers and said toggle lever.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOEL FARRINGTON,

itnesses:

B. M. HARTMAN, MINNIE E. MILLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents, Washington, D. G.

